package com.jiafeng.netty.websocket;

import io.netty.channel.ChannelInitializer;
import io.netty.channel.ChannelPipeline;
import io.netty.channel.socket.SocketChannel;
import io.netty.handler.codec.http.HttpObjectAggregator;
import io.netty.handler.codec.http.HttpServerCodec;
import io.netty.handler.codec.http.websocketx.WebSocketServerProtocolHandler;
import io.netty.handler.stream.ChunkedWriteHandler;


/**
 * @program: nettydome
 * @description:
 * @author: Mr.jia
 * @create: 2019-02-09 19:43
 **/
public class WSServerInitialzer  extends ChannelInitializer<SocketChannel>{

    @Override
    protected void initChannel(SocketChannel ch) throws Exception {
        ChannelPipeline pipeline = ch.pipeline();

        //websocket基于http协议，所以要有http编解码器
        pipeline.addLast(new HttpServerCodec());

        //对写大数据流的支持
        pipeline.addLast(new ChunkedWriteHandler());

        //对httpMessage进行聚合，聚合成Fu1lHttpRequest或FullHttpResponse
        //几乎在netty中的编程，都会使用到此handler
        pipeline.addLast(new HttpObjectAggregator(1024*64));


        //========================= 以上是用于支持http协议 =====================


        /**
         *websocket服务器处理的协议，用于指定给客户端连接访问的路由：/ws
         *本handler会帮你处理一些繁重的复杂的事
         *会帮你处理握手动作：handshaking（close，ping，pong）ping+pong=心跳
         * 对于websocket来讲，都是以frames进行传输的，不同的数据类型对应的frames也不同
         */
        pipeline.addLast(new WebSocketServerProtocolHandler("/ws"));

        //自定义的handler
        pipeline.addLast(new ChatHandler());
    }
}
